ConcurrentHashMap（jdk1.7）put操作確定segment后，加鎖失敗時，自旋外還在遍歷鏈表，什么目的，感覺毫無意義啊privateHashEntryscanAndLockForPut(Kkey,inthash,Vvalue){HashEntryfirst=entryForHash(this,hash);HashEntrye=first;HashEntrynode=null;intretries=-1;//negativewhilelocatingnodewhile(!tryLock()){HashEntryf;//torecheckfirstbelowif(retriesMAX_SCAN_RETRIES){lock();break;}elseif((retries&1)==0&&(f=entryForHash(this,hash))!=first){e=first=f;//re-traverseifentrychangedretries=-1;}}returnnode;}改成這樣有啥問題呢：privateHashEntryscanAndLockForPut(Kkey,inthash,Vvalue){HashEntrynode=newHashEntry(hash,key,value,null);intretries=-1;//negativewhilelocatingnodewhile(!tryLock()){if(++retries>MAX_SCAN_RETRIES){lock();break;}}returnnode;}
oncurrentHashMap（jdk1.7）put操作確定segment后，加鎖失敗時，遍歷鏈表的目的求指導！
冉冉說
2019-10-16 17:08:43
